Hot-rolled seamless pipe

Advantages

OE pipes can operate within a temperature range of -65 to +425°C and, due to their thicker wall, operate at higher pressures than cold-rolled pipes. The H/O pipes are more durable, corrosion-resistant, wear-resistant, while meeting the most stringent sanitary standards and have an attractive appearance. these pipes are reliable, durable, and the possibility of recycling recycled scrap further increases their cost-effectiveness.

Disadvantages

Almost the only disadvantage is the higher cost of these pipes.

Manufacturing

Material for g/d pipes is steel alloys (GOST: 1050-88; 4543-71; 19 281-89 and 380-88). Allotment is determined by GOST 8732-78, technical requirements - GOST 8731-74.

Classification of hot-rolled pipes.
Quality
Quality GOST Note
А 380-88 Of steel St2sp, St4sp, St5sp, St6sp with rated strength properties
Б 380-88, 1050, 4543, 19 281 With standardization of chemical composition of mild steel
В 380-88, 1050, 4543, 19 281 With standardization of strength properties and chemical composition
Г 1050, 4543 и 19 281 With standardization of chemical composition and strength control of heat-treated samples.
Д - Without strength and chemical composition standardization, but with standardization of permissible hydraulic pressure.
The TNK-BP distinguishes three main types of pipe with respect to the ratio of outside diameter to wall thickness
To/s ratio. Name
12,5 - 40 Thin-walled seamless pipes
6 - 12,5; Thick-walled Seamless
Up to 6 Heavy-walled seamless

Seamless Steel Seamless H/W Pipes Outer Diameter: 45-220 mm. Wall Thickness: 3.5-25 mm. Thick-walled pipes are produced heat-treated, they can be welded or solid drawn.

In terms of accuracy, section and length.
In terms of manufacturing precision (external diameter and wall thickness) Sectional shape By length

Normal accuracy

High accuracy

B high

Round,

Square

rectangular

Out of gauge: 4 - 12,5 m;

M -; measured length: within the unmeasured

CR - a multiple of measured: within the measured limit with an allowance for each cut of 5 mm;

Approximate - within the off-measure;

OG - limited.

An example of marking a tube with outer diameter of 185 mm, wall thickness of 3,5 mm, of off-gauge length, regular production accuracy, of steel St2sp, steel grade 1, quality, A GOST 8731 from the ingot:

185x3,5 GOST 8732-78
----------------------------
А St2sp GOST 8731-74

An example of tube marking with 120 mm outer diameter, 2.5 mm wall thickness, 5 000 mm length, with usual thickness accuracy and increased diameter accuracy, made of 09G2S steel:

120p x 2,5x5000 GOST 8732-78
-------------------------------
09G2S GOST 30 564-98

Tube 200v´5v´2000kr - 08X18N10T GOST 9940-81. This pipe with an outer diameter of 200 mm, wall thickness of 5 mm, high precision manufacturing, length multiple of 2000 mm, steel 08X18H10T.

Steel pipes with special properties

Pipes are made of alloy steels according to (GOST 30 564-98) from steel 10, 20 (GOST 1050-88); 10G2, 30KhMA, 15KhM (GOST 4543-7); pipe 09G2S (GOST 19 281-89); 10G2A. Low-alloy structural steel seamless pipe 09G2S is the most popular today.

Application of pipes

Seamless hot-rolled steel pipes are relevant in the manufacture of welded communications, designed for considerable pressure and temperature from -70 to +425 ° C. Thick-walled pipes are popular not only in household sanitary and sewage systems, but are also used in industrial circuits for high pressure gas/liquid transportation. Good thermal conductivity of such pipes is important in heating systems. Longevity, high reliability and moderate price make them highly cost-effective for any piping.

Supply

We supply certified steel pipes at optimum prices. The assortment is normalized by GOST 8732-78. The technical documentation reflects data on percentage composition and mechanical properties of products. With us it is easy to buy in bulk any semi-finished products for large-scale productions. We provide favorable conditions for retail buyers. Our company is distinguished by a high level of service and promptness of service.

Buy at a bargain price

All the tubular goods sold by Evek GmbH comply with GOST and international quality standards. We deliver rolled tubes of standard and non-standard sizes in the shortest terms. High quality, reasonable prices and a wide choice of products determine the face of our company. By becoming our regular customer you can count on a system of discount discounts. Cooperation with us will help you realize any engineering plans. We are waiting for your orders on our site.